As a non-American I found Heather Cox-Richardson's recent substack newsletter post [1] to be useful in understanding how the US has got to this point. She's a history professor at Boston College and she does a good job of describing how gun ownership and control came to be (intentionally) politicised, and how the NRA's role has changed over time. Honestly, I don't see how the US is ever going to dig itself out of thi…
Then when referencing hard numbers and talking about the influence the NRA may have had, she doesn't back that up with anything. Her "notes" are mostly other highly opinionated articles. Had she followed any form of standard or proper notation[1] it'd be easier to believe her. But usually when people fail to make their sources easily available it's because they don't have them/they are low quality.
[https://en.m.wikipedia.org/wiki/Wikipedia:Citing_sources]
Edit:
Just to add another comment to this. Typically when someone claims that something which is supported by a large percentage or even the majority of a given population is the result of "extremism", they themselves are like the extremists, for better or for worse.